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- W4322002043 abstract "The chlorine (Cl·) and bromine atom (Br·) are known to destroy ozone, and Br· accelerates the deposition of toxic mercury (Hg). However, their abundances, sources and impacts in polluted regions are not well understood. In this talk, we give an overview of recent measurements of significant levels of Cl2 and Br2— a producer of Cl· and Br·, respectively —in the coastal atmosphere of Hong Kong. We present field and laboratory evidence to show photodissociation of particulate nitrate being a major production pathway for daytime Cl2 and Br2 and reactive uptake of N2O5 on aerosols as an important nighttime source. Model-calculated and Cl· and Br· from these di-halogens have significant impacts on VOC oxidation, OH radical, ozone production, and Hg oxidation. The findings suggest that reactive halogens may play a larger role in the atmospheric chemistry and air quality of polluted coastal regions than previously thought and call for more research on this issue." @default.
- W4322002043 created "2023-02-26" @default.
- W4322002043 creator A5026429888 @default.
- W4322002043 date "2023-05-15" @default.
- W4322002043 modified "2023-09-29" @default.
- W4322002043 title "Pollution-derived Cl2 and Br2 boost oxidation power of the coastal atmosphere" @default.
- W4322002043 doi "https://doi.org/10.5194/egusphere-egu23-11587" @default.
- W4322002043 hasPublicationYear "2023" @default.
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